My computer shuts down without warning.  Sometimes it reboots, other
times it sits with the fan motor running.  When this happens it will not
allow the power button to do anything.  I asked some "experts" and they
thought it might be the power supply.  I replaced the power supply and
it continues to do this.  I have ran a number of anti-virus stuff and it
has not made a difference.  What could be causing this?  My computer is
a Compaq Presario with an Athalon processor (roughly 2 years old).  The
fan motors all appear to be operating fine and the processor does not
feel very hot to the touch.

Please help,

Rich Rees

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